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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e330b1476783f51e3fc36e3e7ce51b728b9c4df8ad7c532e3b18600cba6eeb' 
  AND token = 'iV8Vb+gv8W8Ifcuq/o4cMgE8ARphU65jFdREItivDoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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