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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02dba78ccb1926fe8e6d7224239163b073bbff920779c1a6ebed78797b91183' 
  AND token = '8WMqTwBRO0iQq9GRod0O7O+FGprZYXgLcuCPcoF6rwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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