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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602da61a025e2cae9f657b38d8ecfaba52eec46ba9be3028b4c4e852a5f3e030' 
  AND token = 'tPLH3lmGoMiPygYvERYlm3yVwDg0e0b98eIsRkmq5Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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