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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd735349bc0ed1c5895cd64c9c34f7459459b3d47ba8de578fd740838b94015' 
  AND token = 'LJNzVx2tcwdQh5jedCerDBcFZd7FM4AHt8AsScsWz68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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