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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9822f797d3cb87d9d18b9ad87be50f9a5c75ccbbcb2f2fe4e00cf5e9b7d90295' 
  AND token = 'AuHyb4swW7it/PBHkRTMxcGwy8wA8B+nSqioYb9Ai0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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