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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1880a42a8e2a3e3fbda2249ad317ee4b67719add751d45fb06376e37d1f45bc0' 
  AND token = 'dsGzHN9w8/E5fwt/fsG6gSnKqZbV8i8BYC067tsurtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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