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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2abddfda41531e0987040bb466b6ec93d775abe403cd649497523cde1d5b68be' 
  AND token = 'Lgb8qXaG3Y9Ij3o22xmuWzCxUNOjIrBs0t8X86ngAnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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