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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956509d34f6beb1c3bd56c246d52e8d70e6891e3864f8111f6dc3a9816ee63e3' 
  AND token = 'xRB4P8WFyfAs9ZiXHga9/elUnEmednXVl5ZozhDYSks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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