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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79887e1736a9a2ffd087ecd9a893b382cf9710a22f509f6ea4bd1bceeed3355d' 
  AND token = 'qlY6d0Fk7Ebg61yI/iZoqvM5YVRBr1te9K75Bh3+HNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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