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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58abca7de1d0bd7349d7b02b438ed3371b418db11b369f283e0ac36a59142996' 
  AND token = '1P30dPc0S/IWe6mV74RpNqJECD2Xd5xhFgsI2GGPFKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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