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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948ba423483503055de15e4f8fa37ed01e96c8aeec4c16e270f7ae91df0c8927' 
  AND token = 'oCnbv4PuCooO+VSzX7IRx64qFcc2QYdgkT6ATadybwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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