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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b80ef6ac1618bb6136d68cbe083b2c0719efa6e8d78b6927454b35bed998a014' 
  AND token = 'KI0PXvqrGiSh8EaVfyuFs3aHiBILGwUccZU6ymm/FZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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