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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f676384819c933526cc3e1472ba27074d2f9ff953a0201a050ee6fb3edac91' 
  AND token = 'fZeP3z795J3DtfMlq8jp2e9Jll3nkyVPnWSOoFUjP04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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