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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b9cc609ec12deaf7e122d7d5cbf867e7a2efb5bd53af8784e33600c98c9cdb' 
  AND token = '5UvwA8akbg76R6+CKWhaJJlZz1IFCD1Rm7v4KVObSm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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