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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b8872b010695e88ab62f55e22ddf94a30a76e4e9ddd1c416fd50735d117e61' 
  AND token = 'TrndBA5q4xOikYhxgks3+HqQAFlX52rE1F33ebfR3ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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