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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ebd9d29aeb3354e566fc1f65ea4ae6bd49e277f3615db3eddb80faeee5cf10' 
  AND token = 'M7pxZJbQcqVvURU22VKk9LwfKPZ4CpDgntnZWu2gRL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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