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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b714567b19d5fd9115281d66f53a639032fe011adced1090f5047eea81555278' 
  AND token = '79bihPaVL/hv+d0kC2VV9GIDm9g4dZzIXplro12Zaew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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