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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8965e14d9214ea95c57c8219d2c04898e068a04c2b80a2c261b8681805faa6c' 
  AND token = 'fI+tlcSFR92m6VubljMOCAgBo+DhDxy2fJQWDQqm/pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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