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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7123e7f811e5645bbfa5a212f4a541b55c9ca71f1da03acd3b93e81af25b7154' 
  AND token = 'W8gqA3eQF3eee6T21LV7RmGxbYqQfhXUs92ne/nf7f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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