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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc96d61fb1c91df4af8e3ad8b34b3affb121f9f4b8246c9ac855b0fa907752bb' 
  AND token = 'mdkk7Mj7M9wY72xjxz/ih7UOlwrlV0Dhz3orFtezyaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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