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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898c152cf5381ab4952e04773bbebee78c0ceb6d517bed3d4d5040a48c059e04' 
  AND token = '+NkqIasHybTDdSZR7W4o4CojjhzAsDK12+VYx2iIJdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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