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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6feaef5fc7a15b296d3d672557c25f0371c6ea316a3b2cb11f6a7cc5bdd9921f' 
  AND token = '/4+LCbwRqDvXVnWESzsRb2xX3Ms3z467L8tVrmzl4JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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