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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded5a52a154a4e485169671ac9d9539c03f1c2b94a2eb9585f197062afe230cf' 
  AND token = 'baqxWan+u/B7MjeddhSd4qv2rOr8NPeEdEW4CCQHx8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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