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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca2d4b3bcfeeaaed99a19e4ef48b1957ef36527b44159abecfe14f2283a7fe08' 
  AND token = 'QPiBoe5O+6Lre6sUX7K2pwhw6j8aYONz6q+LcNx6sx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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