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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bdc7c400e4b4a28285f81de59fc0c4c06a731f2dbe31dc32ea889b5fda5f7f0' 
  AND token = 'h2EVD5ayzP2rZW5VlAI0JbvVFj2aJRUl70xFE/FAcAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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