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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f4fda7b6bf51979d443ecdfe3fa0969c2f7c0b7b7c9a604e56b8fc12e91226' 
  AND token = 'mAxtzulJ6CpxWyydFGQiPEXDoaH9intUNGRJ3TbLYPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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