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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c4c22fd339cba03d76c72dc9e3e542f7e18b0d93f28991a4799ae47ff90e60c' 
  AND token = 'f6edZ2zE3h5hrnzruclIj/rY7myCJcewf58BesBUwQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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