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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf58e35efe79cd43cc57633cfde411e17074753f7511e1e6e986627bd29c4496' 
  AND token = 'pWHizxQKm947Ib5zLgLFbdSgyL1w8vOWnd6ayAl/IJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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