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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd048e71297012da8328b3a6b18292a975d5dd298e1a3f41c23ef4cc556557f9d' 
  AND token = 't4m35RzE8C5Vy1XHpf+XZaynJ7pAaBkzhnUW84rbmG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}