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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e32066914fcdebd3fb158a09086c4e26bf6fba0433a7af1550d8ac4183e9f3' 
  AND token = 'c+EkbP5DrC3orZI5yItCW3c3HDZBS7IWDXF4XUASoBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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