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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b583385e39de820831a57c5a857d65b55b9a6d559cc452fa976cdb0c79c0004' 
  AND token = 'CNGl2EOwlNKvQ4cK8rxAvPe/UZJYGajiprddA2FX0uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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