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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56091a720c957c5b84e8793b4e1fd3ceb4498af7ee011839ecc67b8a38a26b2f' 
  AND token = 'BhDGFRVf/NChNgspgdfc5ieBo1LteID5vCn0yxTO0Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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