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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88030bcc457e88271967228e0cba51522c622bde8098b221924d920d01677e2' 
  AND token = 'ZXHzrAlw6u+tzbLtoG4R/Kbz0yOH1TWoveaHrAZ1Ojc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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