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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25cad26dbf4e4108239b4abb0b75ee3c9d7bab6ff0866acbbe1c43e0ce53a0a' 
  AND token = 'ic5kofYi/cICbdaHidV8rZAB6FKaXeFRFgo1cXRvymY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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