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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b1dba2d61560b46f1a3f1090b845561123bfcb491a1b64af01d7e0097f55dc' 
  AND token = 'ipHkvF5kh7g6psXr7ULh3w5+RCQRepT9Js8qh63qsSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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