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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b98ce77ac0820bd183b411eb90c27c901167c1e4fb9f1872a15169c0a09fa8' 
  AND token = 'DwbolBtmQzc37j6IPBXNS2H8ssTkP549jp39pILQb5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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