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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc8ab6d1af0ed62209e0533fc9aaa686b7d3f88e687ec837c3661ed1549ee1f' 
  AND token = 'SN7EOlN1wmxiBtcH7aa/X795E/RaR+BeSlgzjTUqLJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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