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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c751009985bc9963de4aad23b38c9b34896d6eb408f034bfdb2d5713fdb786' 
  AND token = 'S8qDsskn3xs0uMOPYpynK40zKz9YvG1x9fnLlCAB/qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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