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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82750467edcc97a17ae817141d364892b24f819e69d4b33c663e51b6c183941c' 
  AND token = 'T/KPPl5L7f/CQmQZdCdtD84WdcML8bhwQuXKErO7ar4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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