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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab28fd04e4b554f27c98e57221cb93700ba48c99a626402e0f2cb119d957ac4d' 
  AND token = 'DKe6yo95fOtYczXqVqFxSxpM3Y0gojkkvzOSTknU9IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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