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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da50c2653070f4c838b2096a9a5ec5b14424ac488842e6f1084e991fb030425' 
  AND token = 'M9hp2bRtE2U5zXeMgWh/oYre3BRfIO4aUBCnNpVrWks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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