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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f23326caa9b65795bdb4bfc36ea3db786f25168548a907a149156827c12863b' 
  AND token = 'xg2h4X6aipYoSagIdEb2xkr6sfA33wJlUd9EZerUBww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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