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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4661df33b21b838345d018a0d2f360913349ad4cc463b9a27c2399ec6b8369e1' 
  AND token = 'oBoPcV/6WWKztcRy8SMP1lWbG9LlASfwajtNNGtdB4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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