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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e5bbf86d2600211a78064c0b9a21de8375a02afc3fae7b75f2fe929698a440' 
  AND token = '6DEBQP91zvWkHzSjTyi5TP5ZD0ZTWbl10fgdzCdlanI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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