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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5020012130f128394351948e493321d294109f2e5b297ce73f5e498c7eb4ae10' 
  AND token = 'MUKW6IOxLqWqgB19+ZYBLvZnlaQzYmYXM336qdTsBFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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