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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82fed3c4e11f404c0f26a0a4aae9ec74813d0f134907ac869a513807b018b490' 
  AND token = 'Uo8V+N1w84irljRaMz+dHedNy1gcRMfbkP288NQIB7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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