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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933120f2d9fff4f6258dec186bcddf640aeb6dfe2c56ea4af4e65c9fa0367d25' 
  AND token = '7GaLaTdSPN04MnZmmkyAsVPYXBlde0c6wbSz8ra15x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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