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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6586ac911be9a4085c61a0faf0e751dcc73e20803a41539a6efae6255354ac8' 
  AND token = 'v4HwgdG39Qi1/zUl8cJ0hC3y6UBgaNjv3d2VulW6QG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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