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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c6cdad9ee1b62e382cf3254445128bae876c0877310b3d19c3772aa1a4dacf' 
  AND token = 'cqQChcY1y0ZKvK38d4qZ4WZa/hWCneX7kI8W/kGY+hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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