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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2baa5cfb89a5f2229d4d81cab95a69e03ed28b1ba5079f6b3ead2e3029cc90' 
  AND token = 'LNB5hqRqkXIC612GLccVaNdZjfakJ1/J5Fr56PeqGD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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