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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95136e5b67ac066191a9c7f274b8d72a17caa174deee495295c5fb9a6eda9be2' 
  AND token = 'IKm/Olh6ARJJOGfO+RRzlQh8iFa5M/2Ng8AwFtL3QZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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