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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83da828a5cabc7836ddaa076ad8a00dc614258f6d21903e07f4c489ae270a73' 
  AND token = 'KPXyikW3Fj31ZFkbICR5LOC+RFYxw0OVVpF61DIrhk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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