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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35ad9eac1b6aad99c31952f20fb8c6a5898151e47fa6204ba4d6c36cda11753' 
  AND token = 'K/f4IMx4VK5seffoZkRgMkn65YCnRfNrQi0EszszYj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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