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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed93c40fb5952370de85d0703f266ef0130dfe6dfe375ac4469d282da8f00ae' 
  AND token = 'IL3Exl7WEWjjxWBs+IzDz/it/4uG7NEXsibgW0dZTdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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