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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb58ae36788913fca5807b05141edc1be6d591cb92c7acc06cad09faa304368' 
  AND token = 'QbpOiRztai3Q1b1FHtB+kXRUbIMFASfWS53p8z4LsYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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