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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c510d2f42d531b833b236c8c333c1db474c3849d141d9edbd6ca7a465e4195' 
  AND token = 'yV0QaXB8APdrSL5vUfboXR88rtIwUhaEg7LVohTexr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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