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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c294f53e51101f4ff8071f5d0d4d150ed03c1ae796abc8bd6c53defe1542a12a' 
  AND token = 'hqmdB9q7nDrzQeH81l3cTOmbnQVfY1kQSHN/fXX2qAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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