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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a97856a9c29aeaf7a13e7501ef7660ebe36c547bfe073ffb7d17cc4c022c67' 
  AND token = '+VF7Z+uu9JSB9/5kaFwtKMuKPLzKAoan0hPEbvlrCq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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