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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8204d25ce869e12f26660d56c5b2d3860ed26f3fd7326ab46fa4ee50686329c' 
  AND token = 'u9sdstUfnWfq8DV9/1hYulka2ZmFBIeC7PI95Kg8d1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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