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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf563a77642c01651f866c5a863ed78ccb6fe7f3a49ded3da2848842bccd865' 
  AND token = 'fbb4p7cUYNDRya2P+PIUoBU2/w63X+ORLJQx/E6mpzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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