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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0a190e3724697cba72af17b9d795501c4e69862732149d597347247f5ef9a8' 
  AND token = 'OSw2r2k4EooGFlWOOZfOI9i93qTMpAwZ7tO/M3mUiuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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