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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926baa54f0696f022329090ac9f08351efce2311fd663773d2a29d22fcdb5cf5' 
  AND token = 'BxRW3jWNAPQGyBd1C1s+0Qj2haCQinZ7DLGt7V9Cb9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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