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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dbbbfbbe38cddf0e581effaa3f1e710be3ff29a215dceff29465927e9cf4e92' 
  AND token = 'CYPr8jsbwsu3YqquoDSVQP7bHBBG+eVdSG/yrhxtmco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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